I Built 20,000 Utility APIs for Developers and AI Agents

Building applications and AI agents often involves small but repetitive tasks: processing text, formatting data, working with JSON, and performing calculations.

I wanted to make these utilities easier to access through a single API service, so I built Koyori Utils API.

What is Koyori Utils API?

Koyori Utils API is a collection of 20,000 utility API endpoints designed for developers, automation workflows, and AI agents.

The service includes utilities for:

• Text processing and transformation
• Data formatting
• JSON operations
• Calculations
• General-purpose automation tasks

Built for developers and AI agents

The API service runs on Cloudflare Workers and provides machine-readable OpenAPI documentation to help developers discover and integrate endpoints.

It also offers payment options using STX (Stacks) and USDC.

Why I built it

My goal is to create a practical collection of reusable utilities that developers and AI agents can integrate into their workflows without rebuilding common functions from scratch.

The project is still evolving, and I'm interested in learning which utilities developers find most valuable.

Explore the project

Website: https://koyori-utils-api.koyori-aibtc.workers.dev/

I'd love to hear your feedback!

What kinds of utility APIs would be most useful in your projects?

Thanks for reading!